Hydrangea plant named ‘H213902’

ABSTRACT

A new and distinct cultivar of  Hydrangea  plant named ‘H213902’, characterized by its upright and outwardly spreading plant habit; vigorous growth habit; freely branching habit; strong and sturdy stems; freely and uniformly flowering habit; and large mophead-type inflorescences with numerous large white-colored sterile flowers.

Botanical designation: Hydrangea macrophylla.

Cultivar denomination: ‘H213902’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Hydrangea plant, botanically known as Hydrangea macrophylla, commercially referred to as a mophead-type Hydrangea and hereinafter referred to by the name ‘H213902’.

The new Hydrangea plant is a product of a planned breeding program conducted by the Inventor in De Kwakel, The Netherlands and Glandolf, Germany. The objective of the breeding program was to create new freely-branching Hydrangea plants with strong sturdy stems, large inflorescences, attractive flower color and good postproduction longevity.

The new Hydrangea plant originated from a cross-pollination made by the Inventor in April, 2008 in De Kwakel, The Netherlands, of a proprietary selection of Hydrangea macrophylla identified as code number 01-0215-010, not patented, as the female, or seed, parent with a proprietary selection of Hydrangea macrophylla identified as code number 08-0004-000, not patented, as the male, or pollen, parent. The new Hydrangea plant was discovered and selected by the Inventor as a single flowering plant from within the progeny of the stated cross-pollination in a controlled greenhouse environment in Glandorf, Germany in May, 2010.

Asexual reproduction of the new Hydrangea plant by vegetative cuttings in a controlled environment in Glandorf, Germany since June, 2010 has shown that the unique features of this new Hydrangea plant are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Hydrangea have not been observed under all possible combinations of environmental conditions and cultural practices. The phenotype may vary somewhat with variations in environmental conditions such as temperature and light intensity without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘H213902’. These characteristics in combination distinguish ‘H213902’ as a new and distinct Hydrangea plant:

-   -   1. Upright and outwardly spreading plant habit.     -   2. Vigorous growth habit; freely branching habit.     -   3. Strong and sturdy stems.     -   4. Freely and uniformly flowering habit.     -   5. Large mophead-type inflorescences with numerous large         white-colored sterile flowers.

Plants of the new Hydrangea can be compared to plants of the female parent selection. Plants of the new Hydrangea differ primarily from plants of female parent selection in branching habit as plants of the new Hydrangea are more freely branching than plants of the female parent selection.

Plants of the new Hydrangea can be compared to plants of the male parent selection. Plants of the new Hydrangea differ primarily from plants of male parent selection in growth habit as plants of the new Hydrangea are larger and more vigorous than plants of the male parent selection.

Plants of the new Hydrangea can be compared to plants of the Hydrangea hybrida ‘801’, disclosed in U.S. Plant Pat. No. 16,204. In side-by-side comparisons conducted in De Kwakel, The Netherlands, plants of the new Hydrangea differed from plants of ‘801’ in the following characteristics:

-   -   1. Plants of the new Hydrangea were larger and more vigorous         than plants of ‘801’.     -   2. Plants of the new Hydrangea were more freely branching than         plants of ‘801’.     -   3. Plants of the new Hydrangea had stronger stems than plants of         ‘801’.     -   4. Plants of the new Hydrangea had larger inflorescences and         flowers than plants of ‘801’.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the unique appearance of the new Hydrangea plant showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ from the color values cited in the detailed botanical description which accurately describe the colors of the new Hydrangea plant.

The photograph at the top of the sheet comprises a top perspective view of a typical flowering plant of ‘H213902’ grown in a container.

The photograph at the bottom of the sheet is a close-up view of typical inflorescences of ‘H213902’.

DETAILED BOTANICAL DESCRIPTION

Plants used in the aforementioned photographs and in the following description were grown during the summer in 15-cm containers in a glass-covered greenhouse in De Kwakel, The Netherlands and under cultural practices typical of commercial Hydrangea production. During the production of the plants, day and night temperatures averaged 17° C. Plants of the new Hydrangea were one year old when the photograph and description were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 1995 Edition, except where general terms of ordinary dictionary significance are used.

-   Botanical description: Hydrangea macrophylla ‘H213902’. -   Parentage:     -   -   Female, or seed, parent.—Proprietary selection of Hydrangea             macrophylla identified as code number 01-0215-010, not             patented.         -   Male, or pollen, parent.—Proprietary selection of Hydrangea             macrophylla identified as code number 08-0004-000, not             patented. -   Propagation:     -   -   Type cutting.—By vegetative cuttings.         -   Time to initiate roots, summer.—About two weeks at             temperatures about 23° C.         -   Time to initiate roots, winter.—About 18 days at             temperatures about 18° C.         -   Time to produce a rooted young plant, summer.—About four             weeks at temperatures about 23° C.         -   Time to produce a rooted young plant, winter.—About five             weeks at temperatures about 18° C.         -   Root description.—Thick; whitish brown in color.         -   Rooting habit.—Freely branching; dense. -   Plant description:     -   -   Plant and growth habit.—Upright and outwardly spreading             plant habit; rounded in shape; strong and sturdy stems;             rapid growth rate and vigorous growth habit.         -   Plant height.—About 40 cm to 50 cm.         -   Plant diameter or area of spread.—About 50 cm to 70 cm. -   Lateral branch description:     -   -   Branching habit.—Freely branching habit with about eight to             ten lateral branches per plant.         -   Length.—About 35 cm to 40 cm.         -   Diameter.—About 6 mm to 8 mm.         -   Internode length.—About 5 cm to 7 cm.         -   Stem texture.—Smooth, glabrous.         -   Strength.—Strong, sturdy.         -   Color.—Close to 147C, overlain with close to 187C;             lenticels, close to 186B; color becoming closer to 147C,             overlain with close to 186C; with further with development,             color becoming closer to 177C. -   Leaf description:     -   -   Arrangement.—Opposite, simple.         -   Length.—About 12 cm to 15 cm.         -   Width.—About 10 cm to 11 cm.         -   Shape.—Ovate.         -   Apex.—Acute.         -   Base.—Obtuse.         -   Margin.—Dentate.         -   Texture, upper surface.—Smooth to rugose, glabrous.         -   Texture, lower surface.—Rugose, glabrous.         -   Venation pattern.—Pinnate.         -   Color.—Developing leaves, upper surface: Close to 147A.             Developing leaves, lower surface: Close to 147D. Fully             expanded leaves, upper surface: Close to 147B; venation,             close to 146B. Fully expanded leaves, lower surface: Close             to 147D; venation, close to 146C.         -   Petioles.—Length: About 4 cm. Diameter: About 5 mm to 6 mm.             Texture, upper and lower surfaces: Smooth, glabrous. Color,             upper and lower surfaces: Close to 145B. -   Flower description:     -   -   Flower type and habit.—Large showy sterile flowers and             small, inconspicuous star-shaped fertile flowers arranged on             mophead-type terminal panicles; panicles globular in shape;             flowers face upright to outwardly.         -   Fragrance.—None detected.         -   Natural flowering season.—Plants begin flowering about three             months after planting; short production time as a cooling             treatment is not required for flower development; continuous             flowering during the summer in Northern Europe.         -   Flower longevity.—Sterile flowers last about four months on             the plant, sterile flowers persistent; fertile flowers last             about one month on the plant, fertile flowers not             persistent.         -   Quantity of flowers.—Freely flowering habit; about 80 to 100             sterile flowers per panicle and about 25 to 30 fertile             flowers per panicle.         -   Panicle height.—About 11 cm to 13 cm.         -   Panicle diameter.—About 20 cm to 23 cm.         -   Sterile flower buds.—Length: About 6 mm. Diameter: About             4 mm. Shape: Spherical. Color: Close to 145C.         -   Fertile flower buds.—Length: About 5 mm. Diameter: About             3 mm. Shape: Spherical. Color: Close to 145C.         -   Sterile flower diameter.—About 4.5 cm to 6.5 cm.         -   Sterile flower depth (height).—About 2 cm.         -   Fertile flower diameter.—About 3 mm to 4 mm.         -   Fertile flower depth (height).—About 5 mm.         -   Petals, fertile flowers only, sterile flowers without             petals.—Quantity and arrangement: Five in a single whorl.             Length: About 4 mm. Width: About 2 mm. Shape: Ovate. Apex:             Acute. Base: Attenuate. Margin: Entire. Texture, upper and             lower surfaces: Smooth, glabrous. Color: When opening, upper             and lower surfaces: Close to 145D. Fully opened, upper and             lower surfaces: Close to 155B; color does not change with             development.         -   Sepals, sterile flowers.—Quantity and arrangement: Four in a             single whorl. Length: About 2 cm to 4 cm. Width: About 2.5             cm to 4 cm. Shape: Roughly deltoid to orbicular. Apex: Acute             to obtuse. Base: Cuneate to obtuse. Margin: Entire. Texture,             upper and lower surfaces: Smooth, glabrous. Color: When             opening, upper and lower surfaces: Close to 145C. Fully             opened, upper and lower surfaces: Close to 155B; color does             not change with development.         -   Sepals, fertile flowers.—Quantity and arrangement: Five in a             single whorl. Length: About 2 mm. Width: About 1.5 mm.             Shape: Ovate. Apex: Acute. Base: Obtuse. Margin: Entire.             Texture, upper and lower surfaces: Smooth, glabrous. Color:             When opening, upper and lower surfaces: Close to 145B. Fully             opened, upper and lower surfaces: Close to 145D; color does             not change with development.         -   Pedicels, sterile flowers.—Length: About 1 cm to 3 cm.             Diameter: About 2 mm to 5 mm. Strength: Strong. Texture:             Smooth, glabrous. Color: Close to 155C.         -   Pedicels, fertile flowers.—Length: About 5 mm to 8 mm.             Diameter: About 1.5 mm to 2 mm. Strength: Strong. Texture:             Smooth, glabrous. Color: Close to 155B.         -   Reproductive organs, fertile flowers only; sterile flowers             without reproductive organs.—Stamens: Quantity per flower:             Eight. Filament length: About 3 mm. Filament color: Close to             155B. Anther shape: Conical. Anther length: About 1 mm.             Anther color: Close to 155B. Pollen amount: Abundant. Pollen             color: Close to 155D. Pistils: Pistil quantity per flower:             Three. Pistil length: About 3 mm to 4 mm. Stigma shape:             Oval. Stigma color: Close to 155B. Style length: About 1 mm             to 2 mm. Style color: Close to 155B. Ovary color: Close to             155B.         -   Seeds.—Quantity per flower: About 20 to 30. Length: About             0.5 mm. Diameter: About 0.1 mm. Color: Close to 200C. -   Disease & pest resistance: Under commercial production conditions,     plants of the new Hydrangea have not been observed to be resistant     to pathogens and pests common to Hydrangea plants. -   Temperature tolerance: Plants of the new Hydrangea have been shown     to be tolerant to temperatures ranging from about 3° C. to about 38°     C. 

It is claimed:
 1. A new and distinct Hydrangea plant named ‘H213902’ as illustrated and described. 